LT3954 LED Buck-Boost Driver overview

Description

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LT3954 is a 1 channel, 40.0 V, 0.45 A/string non-sync LED Buck-Boost Driver. It can drive a maximum of 10 LED (~3.5Vfwd) per string, features a adjustable 1000 kHz frequency and is available in 1 package option(s): QFN-36 .

Further characteristics are a feedback voltage of 2.020 V, a typical inductor size of 22.0 uH and a peak efficiency of 95 %.

Parameter and features overview

ParameterValueReplacement
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Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 40.0 V
V-OUT max. 40.0 V
Nr.of LED per string typ. 10
I-OUT/string? 0.45 A
current limit typ. 6.30 A
sync/non-sync non-sync
Frequency typ. 1000 kHz
Frequency adjustable
Frequency min. 100 kHz
Frequency max. 1000 kHz
Softstart yes
Softstart adjustable no
Down-Mode no
Quiescent current max. 2200 uA
Operating min. -40 °C
Operating max. 85 °C
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 125 °C
Inductor size typ. 22.0 uH
feedback voltage 2.020 V
Automotive AEC-Q100 no
Topology Buck-Boost
Peak Efficiency 95 %
Component count min. 20
DC dimming no
PWM dimming yes
PWM frequency min. 0.17 kHz
PWM frequency max. 0.4 kHz
digital dimming no
digital interface no
LED flash no
TxMask no
Nr.of current sources 1
Nr.of package options 1
CSP
SC70
SOT
MSOP
QFN/DFN QFN-36
SO/SOIC
SOP
DIP

LT3954 Datasheet

Link to the most up-to-date LT3954 datasheet and the product page for EVM, tools and support information.

LT3954

LT3954 inventory, samples and price

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List with equivalents & alternatives

The following DC/DC LED Buck-Boost driver are similar to LT3954. Optional, compare LT3954 side-by-side with other LED driver via the comparison function.

Variation Compare Product Manufacturer Package
25% LT3518 LT3518 product overviewLT3518 product overview Linear Technology QFN-16, TSSOP-16
50% LT3517 LT3517 product overviewLT3517 product overview Linear Technology QFN-16, TSSOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3954.

V-IN min. 4.5 V, V-OUT max. 40 V, current limit typ. 6.3 A, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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